American flag on the US Department of Defense building. File photoWASHINGTON, Oct 26 Washington has received a nuclear exercise notification from Russia, US Department of Defense spokesman Patrick Ryder said during a media briefing. He stressed that Moscow is adhering to transparency.» … In this sense, Russia is fulfilling its obligations of arms control and transparency,» the Pentagon official said. According to him, the US military considers the Thunder exercise an annual and routine event, but plans to monitor its implementation anyway.Austin told Shoigu about the importance of continuing contacts, the Pentagon said